Enhance your indoor air quality with the 500ml Air Aroma Essential Oil Diffuser Aromatherapy Humidifier from Aroma Coffee. This ultrasonic humidifier has a tank capacity of 0.7 gallons and features a variable speed control with a quiet operating sound rating of 30 dB. Experience the benefits of aromatherapy with this machine that also functions as an aroma diffuser. The diffuser is equipped with a timerless timer control, water-shortage power-off protection, and a timing function. This green-colored humidifier is perfect for whole house and whole room applications and comes with a manufacturer warranty of 6 months. Add essential oils to the scent of your choice and enjoy a comfortable home environment.